I had my first betta in one of these tanks since January:
He seemed okay, though I didn't think the little filter that came with it was very effective (and the air pump was noisy!). He's since been upgraded to a 10 gallon community tank. I noticed that some Betta owners on this forum have the same sort of tank, it seems like a popular one (I got mine from Petco).
What did/do you think of having a Betta in this size tank? Does your Betta seem happy? Do you find it easy to keep clean (my tank seemed to get dirty pretty quickly)? Do you use any kind of heater? I still have my old tank, and was considering maybe getting another Betta for it, but I wanted to make sure a Betta really can be happy in this size tank.
What are your thoughts?